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Old 18th March 2016, 03:56 PM
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Delboy Delboy is offline
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Location: Lowestoft, Suffolk
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Default Power steering hose failure on S8

Well after reading about other cars of a similar vintage blowing power steering hoses I returned home to the same problem on mine.

I have heard numerous people having the hose cut and joined and the OCD wasn't going to allow that if at all possible so started the investigation this morning and after pulling the liners from the wheel arch and the sump guard I found the culprit to be the return hose from the rack to the cooler.

On the S8 life is made easier if you remove the air box, wheel arch liners, cover that goes around the steering gaiter and also the fog light grill.











The hose thats at the front is the hose that returns oil from the rack to the cooler, cutting off the stainless clamp is the only way forward so I bought 3 of them, two to replce and one extra for any mistakes


With the hose disconnected at the front from the stub and pulled back the damage was easily seen when the braided cover was slid back.



Other end of the hose is under the rack and access is tight but by no means impossible once the covers and wheel arch liner is removed.








With the sound pipe (large black tube) pulled off and moved aside and the smaller tubing moved too the hose can be detached like below



The hose removed and awaiting for replacement coming tomorrow hopefully.


New hose fed through with cap still on to prevent ingress of dirt, once through remove the cap and fit onto pipe, I found that controlling the hose from the other side while lining it up with the pipe worked best, fiddly but not bad.
Leave nut loose till the hose is fully routed to prevent torsion being applied down the hose.


Using the old hose I removed the other hose behind the forward one that goes from cooler to tank and capped it, then fitted the old hose in its place so I could flush the old oil out, use a temporary clips to retain the hoses if you want to do the same.

I bought 3 litres of steering fluid and flushed it through, old stuff was dirty red colour.




When flushing or bleeding its important to not let the reservoir go empty and Audi instructions are to start and shut down immediately until you have purged air from the system.

Using a helper As soon as the engine fires stop it! As that was enough to nearly empty the small reservoir so it is important to be quick to shut down upon starting.

It took 1.5 litres to get clean oil out of the hose in a bucket, I then reconnected the hoses properly using the proper clamps, filled and started for about 5 seconds checked the level again, topped up and ran engine continuously quick check for leaks, all good, then proceeded to slowly go from lock to lock about ten times.

I then sucked the reservoir empty, filled and did the same again twice so in the end i used all three litres of oil and its nice and clean in the reservoir now.

Once satisfied with the oil level, and checked over again for no leaks put the car back together, tested and cleared all the errors from running with no MAF.

Jobs a good un

Items 1,2 & 4 were all that were needed the others depends on what you lose or break

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Last edited by Delboy; 19th February 2018 at 07:46 PM.
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